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1. We are still talking about using the time stone for time travel and parallel universes, right? Wormholes go hand in hand with that stuff. Actual (not movie) astrophysicists believe time travel is possible by wormholes.
Wait. Hold on.
Go back to this.
For real?
Yes. It is essentially the hypothesis behind quantum physics.
To state it in an extremely simplified way, our universe is simply one slice of bread in a giant, infinite loaf of bread, each slice being another theoretical universe that exists that is similar to ours.
Every instance a choice or divergence is made in our universe, a new slice is created in which the opposite choice actually happened.
If you could locate the moment in time in which our universe diverged from the other newly created universe, by locating the "quantum particle" that was created, you could theoretically time travel to that instant in time, in the other universe and move forward in time from there. Scientists have simulated this phenomenon by using photons, essentially sending them back in time.
Likewise, as was mentioned by the OP, Einstein theorized that you could use wormholes to travel through time. Wormholes are basically tunnels that travel through the 5th dimension. Time is the fourth dimension. To get the the fifth dimension, imagine you want to get from point A on a piece of paper to point B, where each of the two points are moments in time. By rolling the paper into a tube, and making it so that point A now touches point B directly, that's the essence of the 5th dimension. Now, if you shoved your pencil through the two points, that one single hole or "tunnel" is essentially a wormhole. They demonstrate this principal in the new movie "Interstellar" in fact.
So to go back in time in a wormhole, its simply a matter of reversing things, and going from point B to point A. It's all very theoretical still, but not unproven.
Sorry if I'm not very good at explaining it, or if I've made some inaccuracies. I'm not a scientist, this is just my understanding of it from reading and NOVA.